================
@@ -148,6 +148,333 @@ bool RootSignatureLexer::LexToken(RootSignatureToken
&Result) {
return false;
}
+// Parser Definitions
+
+RootSignatureParser::RootSignatureParser(
+ SmallVector<RootElement> &Elements,
+ const SmallVector<RootSignatureToken> &Tokens)
+ : Elements(Elements) {
+ CurTok = Tokens.begin();
+ LastTok = Tokens.end();
+}
+
+bool RootSignatureParser::ReportError() { return true; }
+
+bool RootSignatureParser::Parse() {
+ CurTok--; // Decrement once here so we can use the ...ExpectedToken api
+
+ // Iterate as many RootElements as possible
+ bool HasComma = true;
+ while (HasComma &&
+ !TryConsumeExpectedToken(ArrayRef{TokenKind::kw_DescriptorTable})) {
+ if (ParseRootElement())
+ return true;
+ HasComma = !TryConsumeExpectedToken(TokenKind::pu_comma);
+ }
+ if (HasComma)
+ return ReportError(); // report 'comma' denotes a required extra item
+
+ // Ensure that we are at the end of the tokens
+ CurTok++;
+ if (CurTok != LastTok)
+ return ReportError(); // report expected end of input but got more
+ return false;
+}
+
+bool RootSignatureParser::ParseRootElement() {
+ // Dispatch onto the correct parse method
+ switch (CurTok->Kind) {
+ case TokenKind::kw_DescriptorTable:
+ return ParseDescriptorTable();
+ default:
+ llvm_unreachable("Switch for an expected token was not provided");
+ return true;
+ }
+}
+
+bool RootSignatureParser::ParseDescriptorTable() {
+ DescriptorTable Table;
+
+ if (ConsumeExpectedToken(TokenKind::pu_l_paren))
+ return true;
+
+ // Iterate as many DescriptorTableClaues as possible
+ bool HasComma = true;
+ while (!TryConsumeExpectedToken({TokenKind::kw_CBV, TokenKind::kw_SRV,
----------------
V-FEXrt wrote:
You need the `while (HasComma && ...` here right? Otherwise it will continue
looping even if the comma is missing?
https://github.com/llvm/llvm-project/pull/122982
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